Precision Digital Corporation Helios PD2-6262, Instruction Manual

Page: 32 / 61

Helios PD2-6262 Dual Analog Input Rate/Totalizer
Instruction Manual
32
Input Calibration Method (
InCAL
)
There are two methods of calibrating (or scaling) the
display for each input channel to show the correct
engineering units.
•
Use the Scale menu to enter the scaling without a
signal source.
•
Use the Calibrate menu to apply a signal from a
signal source.
Note: The Scale and Calibrate functions are exclusive
of each other. The meter uses the last function
programmed. Only one of these methods can be
employed at a time. The Scale and Calibrate
functions can use up to 32 points (default is 2). The
number of points should be set in the Advanced menu
prior to scaling and calibration of the meter.
See Multi-Point Linearization
(
Linear
) menu on page
50 for details.
Scaling the Meter without a Signal
Source (
SCAL-A
,
SCAL-B
)
The process inputs (4-20 mA,

10 VDC) can be
scaled to display the process variables in engineering
units. A signal source is not needed to scale the
meter; simply program the inputs and corresponding
display values.
From the
INCAL
menu, select channel A or B,
followed by
SCal-A
or
SCal-B
, and then set the input
signal value and display value for each of the scaling
points (default is two).
Scaling the Meter for Channel A
(
SCal-A
)
Scaling the Meter for Channel B
(
SCal-B
)
For instructions on how to program numeric
values see Setting Numeric Values , page 28 .
Error Message (
Error
)
An error message indicates that the calibration or
scaling process was not successful.
After the error message is displayed, the meter
reverts to input 2 during calibration or scaling and to
input 1 during internal calibration, allowing the
appropriate input signal to be applied or programmed.
The error message might be caused by any of the
following conditions:
1. Input signal is not connected to the proper
terminals or it is connected backwards.
2. Wrong signal selection in Setup menu.
3. Minimum input span requirements not
maintained.
4. Input 1 signal inadvertently applied to calibrate
input 2.
Minimum Input Span
The minimum input span is the minimum difference
between input 1 and input 2 signals required to complete
the calibration or scaling of the meter.
Input Range Input 1 & Input 2 Span
4-20 mA 0.15 mA

10 VDC 0.10 VDC